Our site uses cookies necessary for its proper functioning. To improve your experience, other cookies may be used: you can choose to disable them. This can be changed at any time via the Cookies link at the bottom of the page.


Polypropylene multi-layer-pipes - 100 year lifetime assessment using linear elastic fracture mechanics

 

Papers

Plastic Pipes Conference Association # 2016 Berlin

Univ.-Prof. DI Dr. mont. Gerald PINTER, DI Florian ARBEITER

Applying scientifically well established and investigated linear fracture mechanic methods (LEFM) the kinetics of the slow crack growth (SCG) on polypropylene layers and coextruded interfaces on multi-layer-pipes could be investigated. Taking effects of ageing and stress relaxation during the service lifetime into consideration, it was possible to predict the lifetime of such a pipe of at least 100 years. 

Co-extruded multi-layer pipes out of polypropylene have been widely used in nonpressure sewerage applications for several years. Due to good material properties and generally low mechanical loads not many critical failures are noticed up to now. For the lifetime assessment over 50 years internal pressure tests are performed at the moment to determine, whether SCG is threatening the integrity of the whole structured wall pipe.

This paper presents results achieved on a co-extruded multi-layer polypropylene pipe with a middle-layer consisting of mineral reinforced polypropylene block copolymer, taking into consideration, that the pipe is subjected to ageing effects and due to relaxation the stress level is reduced during the lifetime. 

In particular LEFM were applied, characterizing the SCG on the polymer materials and the coextruded interfaces. The crack initiation and crack growth as well as the SCG kinetics was investigated by using static methods (Single-Edge-Notched Bend, SENB) and cyclic fatigue tests with different loading ratios (Cracked Round-Bar, CRB).

By using these results it was possible to show, that the phenomenon of SCG can occur in both, reinforced and un-reinforced polypropylene block copolymer. Evaluating the kinetics of the SCG, it was possible to predict the lifetime of such a pipe of at least 100 years. 

Related keywords : Polypropylene, Pipes, Lifetime, Linear Fracture Mechanics.
Please note that the whole article content is available on PPCA website only :

Related papers

2021 Amsterdam : A COST BENEFIT ANALYSIS OF PVC PIPES RECYCLING

Author(s) : A. Marangoni

The quality of infrastructures is a key driver for maximizing the performance of the utilities networks and minimizing the environmental impacts associated with their operation. The water and sewer pipes are key network elements to guarantee a satisfactory service to the citizens. Their end-of-life management is an...

2021 Amsterdam : A METHODOLOGY TO DETERMINE CHARPY IMPACT STRENGTH OF NOTHCED SPECIMEN CUT FROM PLASTICS PIPES

Author(s) : Li, Yanjun, Xiang, Aimin, Xu, HaiyunBeijing, Xie, Jianling, Ho, Kinman, Xu, HaiyunBeijing

It is necessary to evaluate the impact resistance of plastics pipes as they have the potential to be damaged by hitting or colliding during storage, transportation and installation. As a well-established test method, the Charpy impact strength of unnotched test pieces cut from thermoplastics pipes is determined...

2021 Amsterdam : A NEW GENERATION OF HIGH PERFORMANCE BIAXIALLY ORIENTED POLYETHYLENE AND POLYPROPYLENE PRESSURE PIPES

Author(s) : A. Taraiya, P. Degenhart, M. Soliman, M. Boerakker, R. Handstanger, R. Kleppinger

Since the introduction of polyolefins for pressure pipes, continuous improvements have been made to meet ever-higher demands on their performance and to expand their application window beyond their original scope, mostly based on new resin formulations. Today, we also continue to push the limit to provide better...

2021 Amsterdam : AN EVIDENTIAL APPROACH TO USE OF POLYETHYLENE PIPE FOR HYDROGEN FUEL GASES

Author(s) : Derek Muckle

A technical program has been undertaken to provide evidence on the suitability of polyethylene pipe and fitting systems for the distribution of hydrogen fuel gas. The underlying principle has been to evaluate material in the form of a pipe and to consider the performance of the pipe and of the welded jointing systems...

2021 Amsterdam : DESIGN OF LARGE DIAMETER BURIED PIPES

Author(s) : Anders Andtbacka, Peter Sejersen

In the late nineties a study of the behavior of buried thermoplastics pipes was carried out. The project had input and participants from both the plastic pipe industry as well as from external organizations. Six external leading experts in the field of pipeline design, not necessarily plastics pipes design, have been...

2021 Amsterdam : DEVELOPMENT OF A RAPID AND INNOVATIVE IN-FACTORY PROCEDURE FOR TESTING THE PERFORMANCES OF PE PIPES CONTAINING VARIOUS PROPORTIONS OF RECYCLED POLYMER MATERIAL

Author(s) : Dominique GUEUGNAUT, Pascal AUSSANT, Romuald BOUAFFRE, Myriam BECHROURI

Concerns regarding the environment and sustainable development have revived interest in the reprocessing and re-use of polymer materials from manufactured objects that have reached the end of their operating life. Within this framework, formal professional agreements have been put in place at global level under the...

2021 Amsterdam : EVALUATION OF MECHANICAL PROPERTIES AND LONG- TERM DURABILITY OF AGED POLYETHYLENE PIPES FOR GAS DISTRIBUTION

Author(s) : Shuhei Nishida, Shintaro Iwasaki, Hidefumi Yamanaka, Takahiro Kasatani

Polyethylene pipelines have been used for natural gas service applications for over 40 years in Japan. It is thought that they will continue to be used widely for many years. Therefore, it is important to confirm the conditions of the existing pipelines being used for the long term. In this study, polyethylene pipes...

2021 Amsterdam : FIRST USE OF PE100-HT CONDUITS FOR ADVANCING THE CONTAINMENT OF UNDERGROUND HIGH VOLTAGE CABLES

Author(s) : Dr. Holger Brüning, Serge Hascoët, Yann Delanne, Didier Nozahic, Jawdat Mansour, José Santana

RTE operates, maintains and develops the French electricity network, including the High and very High Voltage cable lines. Their network is the largest in Europe and includes over 6400 km of underground HV links operated in 2018. The company is modernizing and developing its network by investing 1.5 billion euros per...

2021 Amsterdam : FRACTURE MECHANICS TECHNIQUES IN LARGE DIAMETER PVC PIPES

Author(s) : Antonio Rodolfo Jr., Vanderley M. John

Unplasticised (U-PVC) and modified (M-PVC) pipes used in irrigation and infrastructure applications, outside diameter 326 mm, were evaluated according to various fracture mechanics methodologies, including fracture toughness (stress intensity factor KC and energy release rate GC, both at fracture), essential work of...

2021 Amsterdam : FROM MULTILAYER LAMINATES TO INDUSTRIAL PIPE APPLICATIONS – A GUIDELINE

Author(s) : Gerald Pinter, Johannes Wiener, Florian Arbeiter, Abhishek Tiwari, Otmar Kolednik

For pipe applications, catastrophic failure due to crack growth has to be prevented by all means. Techniques to develop new and even tougher pipe materials are explored in this contribution. The aim is to create a multi-layer architecture, that exhibits high toughness as well as damage tolerance towards sharp notches....

2021 Amsterdam : HYDROGEN TRANSPORT IN POLYMER PIPES FOR NATURAL GAS DISTRIBUTION – TEN YEARS OF EXPERIENCE

Author(s) : Stephan Kneck, Henrik Iskov

It has become ever clearer that the resources of natural gas are an energy source, which will be less important in the future due to limitations in use of natural reserves. In order to prepare for the future the gas industry is looking at the alternative fuel gases, one such fuel gas is hydrogen. In order to prepare...

2021 Amsterdam : INNOVATIVE MILLIMETER WAVE TECHNOLOGY FOR MEASURING THE PIPE WALL THICKNESS EARLY IN THE EXTRUSION PROCESS

Author(s) : Christian Schalich

Plastic pipes for infrastructure and building applications are precisely specified with regards to wall thickness and diameter. Pipe manufacturers use different measuring methods in order to ensure the required dimensional accuracy and maintain a constant high quality. This paper introduces a measuring system based on...

2021 Amsterdam : MECHANICAL INTERGRITY OF HDPE BUTT FUSION JOINTS – EFFECT OF CARBON BLACK DISTRIBUTION

Author(s) : Suleyman Deveci, Nisha Preschilla, Sulistiyanto Nugroho, Birkan Eryigit

Carbon black (CB) has been used as a perfect and the cheapest solution to prevent photo degradation of polyethylene against UV light exposure. The effect of carbon black on the mechanical properties of polyethylene pipes was studied extensively, but only on well dispersed and distributed carbon black...

2021 Amsterdam : MULTILAYER POLYMER PIPES – THE INFLUENCE OF RESIDUAL STRESS ON FATIGUE LIFETIME

Author(s) : Lukas Travnicek, Pavel Hutar, Jan Poduska, Andreas Frank, Florian Arbeiter, Jaroslav Kucera, Jiri Sadilek, Gerald Pinter, Lubos Nahlik

The application of recycled material in pressure piping systems has been considered lately – it was suggested, that the recycled polyethylene could be used as a part of a multilayer pipe together with virgin material. This type of pressure pipes is not availableon the market yet, so their properties can be only...

2021 Amsterdam : MUTUAL RECOGNITION OF THE CERTIFICAT ION SCHEMES IN EUROPE

Author(s) : Horst Stimmelmayr, Peter Sejersen

The voluntary certification scheme for plastic multilayer piping systems for hot and cold drinking water inside buildings is a joint effort of two key European organizations. It was initiated in close cooperation with the Brussels based European trade association of plastic pipe and fittings manufacturers, TEPPFA....

2021 Amsterdam : PLASTIC PIPES FOR WATER DRAINAGE IN RAIL- AND MOTORWAY TUNNELS – A MAJOR CHALLENGE

Author(s) : Florian Arbeiter, Tobias Schachinger, Stefanie Eichinger, Gisbert Rieß, Michael Stur, Michael Steiner, Florian Saliger

Plastic pipes are of outstanding importance for the distribution of potable and process waters, oil and gas, as well as for sewer and waste water disposal. However, plastic pipes are also used in many other technical areas. Especially in European countries with mountainous regions, such as Austria, Switzerland, Italy...

2021 Amsterdam : POLYPROPYLENE PIPE IN DEMANDING HYDRONIC HEATING APPLICATIONS

Author(s) : Steve Sandstrum, Chris Ziu

The market for high performance polypropylene (PP) piping systems in North America continues to evolve. Generally, PP piping systems have performed exceptionally well in a variety of challenging HVAC, industrial and plumbing applications. As a result, the engineering community in North America is embracing higher...

2021 Amsterdam : PVC Pipes TRAINING PACKAGE: 2020 UPDATE!

Author(s) : Sylvie Famelart, Vincent. Stone

In order to deliver to the market reliable and consistent information about PVC and the different PVC pipe solutions, a Training Package was developed a few years ago. The package was made up of a set of standalone PowerPoint slides, providing information on PVC-U and PVC-C pipe systems. Information on both general...

2021 Amsterdam : PVC PIPES WITH SUPERIOR ROOT INTRUSION RESISTANCE

Author(s) : Argnani Claudio, Ing. Gianpaolo Contarini

...Clogging of the pipes can be experienced in sewer systems after a short period of service, due to the intrusion of roots from plants and trees. Plants, and in particular their roots, are attracted by the water flowing inside the pipes. These roots will strain the connections between pipes, in particular the sockets...

2021 Amsterdam : SLOW CRACK GROWTH IN POLYETHYLENE PIPES: FRACTURE SURFACE EVIDENCE FOR THE SLOW CRACK GROWTH MECHANISM IN ACCELERATED TESTS

Author(s) : Mark Boerakker, Rudy Deblieck, a Harm Caelers, Arno Wilbers, Tine Boonen a DSM, Britta Gerets, Mirko Wenzel

Components made of plastic are facing ever-increasing demands with respect to their production, use and durability. This also holds for gas and drinking water pressure pipes made of high-density polyethylene (PE-HD), where service lifetimes of up to 50 years and in some cases even 100 years are required. One of the...

Members of the Association

BOREALISBOROUGEFormosa Plastics CorporationHanwha TotalEnergiesINEOS O&PIRPCKorea Petrochemical IND. Co., LTD (KPIC)LyondellBasellORLEN UnipetrolPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE